setDefaultCloseOperation 改为显示 JFrame

2022-01-24 00:00:00 java swing jframe windowlistener

为了练习 Java，我正在制作一个文字处理器应用程序，我希望这样当用户尝试关闭应用程序时，会出现一个 JFrame，要求保存更改.

I am making a word processor application in order to practise Java and I would like it so that when the user attempts to close the appliction, a JFrame will come up asking to save changes.

我正在考虑 setDefaultCloseOperation() 但到目前为止我运气不佳.如果可能的话，我也希望它在用户单击窗口右上角的X"时出现.

I was thinking about setDefaultCloseOperation() but I have had little luck so far. I would also like it to appear whent he user clicks the "X" on the top right of the window aswell if possible.

推荐答案

您可以将 JFrame DefaultCloseOperation 设置为 DO_NOTHING 之类的东西，然后设置一个 WindowsListener 来获取关闭事件并执行您想要的操作.我会在几分钟后发布一个示例.

You can set the JFrame DefaultCloseOperation to something like DO_NOTHING, and then, set a WindowsListener to grab the close event and do what you want. I'll post an exemple in a few minutes .

这是示例:

public static void main(String[] args) {
        final JFrame frame = new JFrame("Test Frame");

        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

        frame.setSize(800, 600);

        frame.addWindowListener(new WindowAdapter() {
            //I skipped unused callbacks for readability

            @Override
            public void windowClosing(WindowEvent e) {
                if(JOptionPane.showConfirmDialog(frame, "Are you sure ?") == JOptionPane.OK_OPTION){
                    frame.setVisible(false);
                    frame.dispose();
                }
            }
        });

        frame.setVisible(true);
    }

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